CN109477927B - Polarizing plate assembly, liquid crystal display panel and liquid crystal display device - Google Patents
Polarizing plate assembly, liquid crystal display panel and liquid crystal display device Download PDFInfo
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- CN109477927B CN109477927B CN201780044414.6A CN201780044414A CN109477927B CN 109477927 B CN109477927 B CN 109477927B CN 201780044414 A CN201780044414 A CN 201780044414A CN 109477927 B CN109477927 B CN 109477927B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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Abstract
The invention provides a polarizing plate assembly capable of suppressing warpage generated in a liquid crystal display panel. The polarizing plate assembly is a polarizing plate assembly (1) provided with a first polarizing plate (2) arranged on the display surface side of a liquid crystal cell (20), and a second polarizing plate (3) and a reflective polarizing plate (6) arranged on the opposite side of the display surface of the liquid crystal cell (20), wherein the first polarizing plate (2) comprises a first polarizing film (4) having a polarized light absorption axis (A) in the short-side direction, the second polarizing plate (3) comprises a second polarizing film (5) having a polarized light absorption axis (B) in the long-side direction, and the reflective polarizing plate (6) has a polarized light reflection axis (C) in the long-side direction.
Description
Technical Field
The invention relates to a polarizing plate assembly, a liquid crystal display panel and a liquid crystal display device.
Background
Conventionally, a liquid crystal display device is known as an image display device. In a liquid crystal display device, an image can be displayed by making illumination light emitted from a backlight incident on the back surface side of a liquid crystal display panel and making light modulated by the liquid crystal display panel exit from the front surface side of the liquid crystal display panel.
The liquid crystal display panel includes a liquid crystal cell and a pair of polarizing plates disposed on both sides of the liquid crystal cell. As the pair of polarizing plates, a polarizing film (absorption-type polarizing plate) in which a dichroic dye such as iodine is adsorbed and oriented on a stretched film obtained by stretching a polyvinyl alcohol (PVA) -based resin film is generally used. However, such a polarizing film transmits light polarized in the transmission axis direction and absorbs most of light polarized in the direction orthogonal to the transmission axis (absorption axis direction), and therefore about 50% of the illumination light emitted from the backlight is not used.
Therefore, recently, in order to improve the utilization efficiency of the illumination light emitted from the backlight, a polarizing plate in which a reflective polarizer is laminated on a polarizing film with an adhesive interposed therebetween is used for a polarizing plate disposed on the back side of the liquid crystal cell (for example, see patent document 1). The reflection type polarizing plate has a reflection axis in a direction orthogonal to the transmission axis of the polarizing film, and has a function of transmitting light polarized in the transmission axis direction and reflecting light polarized in the absorption axis direction to the backlight side. In this way, light polarized in the absorption axis direction is reflected by the backlight side, converted into light polarized in the transmission axis direction, and then incident on the polarizing film, and therefore can be reused without being absorbed by the polarizing film.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016 & 85444-
Disclosure of Invention
Problems to be solved by the invention
However, in the above-described liquid crystal display device, as the liquid crystal display panel is thinned, the liquid crystal display panel is warped due to shrinkage of the polarizing plate. In particular, in liquid crystal display devices for mobile use, such a problem is more remarkable in the progress of thinning of liquid crystal display panels, specifically, thinning of glass substrates constituting liquid crystal cells.
The present invention has been made in view of the above-described conventional circumstances, and an object thereof is to provide a polarizing plate assembly capable of suppressing the occurrence of warpage in a liquid crystal display panel, a liquid crystal display panel provided with such a polarizing plate assembly, and a liquid crystal display device provided with such a liquid crystal display panel.
Means for solving the problems
As a means for solving the above-described problems, according to an aspect of the present invention, there is provided a polarizing plate assembly comprising: the liquid crystal display device includes a first polarizing plate disposed on a display surface side of a liquid crystal cell, the first polarizing plate including a first polarizing film having a polarized light absorption axis in a short-side direction, a second polarizing plate disposed on an opposite side of the liquid crystal cell from the display surface, the second polarizing plate including a second polarizing film having a polarized light absorption axis in a long-side direction, and a reflective polarizer having a polarized light reflection axis in the long-side direction.
In one aspect of the present invention, the following configuration may be adopted: the second polarizing plate and the reflective polarizer are laminated with an adhesive or bonding agent interposed therebetween.
In one aspect of the present invention, the following configuration may be adopted: the reflection type polarizer has a dimensional change rate of-1.4% or more in a direction along the reflection axis of the polarized light when heated at 85 ℃ for 100 hours.
In addition, according to an aspect of the present invention, there is provided a liquid crystal display device including a liquid crystal cell and any one of the above-described polarizing plate assemblies.
In addition, according to an aspect of the present invention, there is provided a liquid crystal display device including the liquid crystal display panel and a backlight.
ADVANTAGEOUS EFFECTS OF INVENTION
As described above, according to one aspect of the present invention, it is possible to provide a polarizing plate assembly capable of suppressing warpage generated in a liquid crystal display panel in a high-temperature environment or the like, a liquid crystal display panel provided with such a polarizing plate assembly, and a liquid crystal display device provided with such a liquid crystal display panel.
Drawings
Fig. 1 is a schematic diagram for explaining the arrangement relationship of the polarizing plate assembly according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view showing a structure of the polarizing plate assembly shown in fig. 1, wherein (a) is a schematic cross-sectional view showing one structure example of the first polarizing plate, and (b) is a schematic cross-sectional view showing one structure example of the second polarizing plate.
Fig. 3 is a schematic cross-sectional view showing the structure of a liquid crystal display panel including the polarizing plate module shown in fig. 2.
Fig. 4 is a schematic cross-sectional view showing a configuration of a liquid crystal display device including the liquid crystal display panel shown in fig. 3.
Fig. 5 (a) is a schematic diagram showing the arrangement relationship of the model a, and (B) is a schematic diagram showing the arrangement relationship of the model B.
Fig. 6 (a) is a characteristic diagram showing the results of measuring the warpage amount of the model a, and (B) is a characteristic diagram showing the results of measuring the warpage amount of the model B.
Fig. 7 is a characteristic diagram showing the results of measuring the change in the dimensional change rate (%) when the reflective polarizer was heated at 85 ℃.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings used in the following description, the components are schematically illustrated in some cases in order to facilitate understanding of the components, and scales having different sizes are also illustrated depending on the components.
(polarizing plate Assembly)
First, as an embodiment of the present invention, for example, an arrangement relationship of the polarizing plate assembly 1 shown in fig. 1 will be described. Fig. 1 is a schematic diagram for explaining the arrangement relationship of the polarizing plate assembly 1.
As shown in fig. 1, the polarizing plate assembly 1 of the present embodiment includes: a first polarizing plate 2 disposed on the display surface (front surface) side of the liquid crystal cell 20, and a second polarizing plate 3 and a reflective polarizer 6 disposed on the opposite side (back surface) of the liquid crystal cell 20 from the display surface.
The first polarizing plate 2 includes a first polarizing film 4 having a polarized light absorption axis a in a short side direction. On the other hand, the second polarizing plate 3 includes a first polarizing film 5 having a polarized light absorption axis B in the longitudinal direction.
On the other hand, the reflection type polarizing plate 6 has a polarization reflection axis C in the longitudinal direction. The second polarizing plate 2 and the reflective polarizer 6 are laminated with an adhesive or bonding agent (not shown) interposed therebetween.
The liquid crystal display panel 30 of the present embodiment can be configured by using the polarizing plate assembly 1 of the present embodiment, by bonding the first polarizing plate 2 to the front surface side of the liquid crystal cell 20 via an adhesive layer, bonding the second polarizing plate 3 to the back surface side of the liquid crystal cell 20 via an adhesive layer, and orienting the reflective polarizer 6 to the opposite side to the side facing the liquid crystal cell 20.
In the liquid crystal display panel 30 of the present embodiment, by using the polarizing plate assembly 1, warpage due to shrinkage of the first polarizing plate 2, the second polarizing plate 3, and the reflective polarizer 6 can be suppressed, and thus display quality can be improved.
Next, a specific structure of the polarizing plate assembly 1 will be described with reference to (a) and (b) of fig. 2. Fig. 2 (a) is a schematic cross-sectional view showing one configuration example of the first polarizing plate 2. Fig. 2 (b) is a schematic cross-sectional view showing one configuration example of the second polarizing plate 3.
For example, as shown in fig. 2 (a), the first polarizing plate 2 has a structure in which a first polarizing film 4, a first protective film 7 on a surface of the first polarizing film 4 on the side opposite to the liquid crystal cell 20, and a second protective film 8 on a surface of the first polarizing film 4 on the side opposite to the liquid crystal cell 20 are stacked.
For example, as shown in fig. 2 (b), the second polarizing plate 3 has a structure in which a second polarizing film 5 and a third protective film 9 on the surface of the second polarizing film 5 opposite to the liquid crystal cell 20 are stacked. The reflection-type polarizing plate 6 is laminated on the surface of the second polarizing film 5 opposite to the liquid crystal cell 20. A protective film may be disposed between the second polarizing film 5 and the reflective polarizer 6.
The reflection-axis direction dimensional change rate of the reflection-type polarizing plate 6 is preferably-1.4% or more.
The dimensional change rate of the first polarizing plate 2 and the dimensional change rate of the second polarizing plate 3 used in combination with the reflection polarizer are preferably-1.0 to 0% in the absorption axis direction and-0.5 to 0% in the transmission axis direction.
By adopting such a combination, the warpage of the liquid crystal panel 30 can be further reduced. The dimensional change rate can be controlled by adjusting, for example, the drying time, drying temperature, thickness of the polarizing film, and stretching ratio of the polarizing film after the protective film is laminated on the polarizing film.
Here, the dimensional change rate of the polarizing plate when heated at 85 ℃ for 100 hours is a value measured in the following manner. Specifically, the polarizing plate was cut into a size of 100mm in the absorption axis direction × 100mm in the transmission axis direction, and after standing for 1 day in an environment at a temperature of 23 ℃ and a relative humidity of 55%, the dimension in the absorption axis direction (or transmission axis direction) (the dimension before heat treatment) was measured.
Next, the dimension in the absorption axis direction (or transmission axis direction) (dimension after heat treatment) of the polarizing plate after standing still for 100 hours in a high temperature environment at a temperature of 85 ℃. Substituting the measurement results into the following formula S0From this, the dimensional change rate in the absorption axis direction (or the dimensional change rate in the transmission axis direction) can be obtained.
S0(size after heat treatment-size before heat treatment) × 100)/size before heat treatment (polarizing film)
The first polarizing film 4 and the second polarizing film 5 are absorption-type polarizing plates, and normally, polarizing films in which a dichroic dye such as iodine is adsorbed and oriented to a polyvinyl alcohol (PVA) -based resin film are used. The PVA-based resin is obtained by saponifying a polyvinyl acetate-based resin.
Examples of the polyvinyl acetate resin include polyvinyl acetate which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable with vinyl acetate. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
The saponification degree of the PVA resin is usually 85 to 100 mol%, and preferably 98 mol% or more. The PVA resin may be further modified, and polyvinyl formal, polyvinyl acetal, or the like modified with an aldehyde may be used.
The polymerization degree of the PVA-based resin is usually 1,000 to 10,000, preferably 1,500 to 5,000. Specific examples of the PVA-based resin and the dichroic dye include the PVA-based resin and the dichroic dye exemplified in japanese patent laid-open publication No. 2012-159778.
The polarizing film can be produced by a known method, without any particular limitation. Specifically, the polarizing film is produced, for example, by the following steps: stretching a PVA-based resin film in a uniaxial stretching step; a step of dyeing a PVA-based resin film with a dichroic dye and allowing the dichroic dye to adsorb; treating the PVA-based resin film having the dichroic dye adsorbed thereon with an aqueous boric acid solution; a step of washing with water after the treatment with the boric acid aqueous solution; and a drying step. The polarizing film can be continuously produced by moving a long strip-shaped PVA-based resin film in a production line.
The polarizing film can be produced by the method described in japanese patent application laid-open No. 2012-159778, for example. In this method, a PVA-based resin film as an absorption-type polarizing plate can be formed by applying a PVA-based resin to a substrate film.
The thickness of the raw material film containing the PVA-based resin is not particularly limited, and is, for example, 150 μm or less. In view of ease of stretching, the film thickness is preferably 3 μm or more, and preferably 75 μm or less.
The first polarizing film 4 and the second polarizing film 5 may be the same polarizing film or different polarizing films.
(protective film)
The first protective film 7, the second protective film 8, and the third protective film 9 are preferably formed of a thermoplastic resin film having excellent transparency, uniform optical characteristics, mechanical strength, thermal stability, and the like. As the thermoplastic resin film, a thermoplastic resin film formed of a cellulose-based resin such as triacetyl cellulose or diacetyl cellulose, a polyester-based resin such as polyethylene terephthalate, polyethylene isophthalate, or polybutylene terephthalate, a (meth) acrylic resin such as poly (methyl) acrylate or poly (ethyl (meth) acrylate), a polycarbonate-based resin, a polyether sulfone-based resin, a polysulfone-based resin, a polyimide-based resin, a polyolefin-based resin such as polyethylene or polypropylene, a polynorbornene-based resin, or the like can be used. Among them, a thermoplastic resin film formed of a cellulose-based resin, a polyester-based resin, (meth) acrylic-based resin, a polycarbonate-based resin, or a polyolefin-based resin is preferably used. The term "(meth)" as used herein means either a methacrylate or an acrylate, and the same applies to "(meth)" in the case of (meth) acrylic acid.
Further, commercially available products can be suitably used for the thermoplastic resin film. As commercially available products of cellulose resin films, there can be mentioned: "FUJITAC (registered trademark) TD 80", "FUJITAC (registered trademark) TD80 UF", and "FUJITAC (registered trademark) TD80 UZ", manufactured by fuji film corporation; "KC 2 UAW", "KC 8UX 2M" and "KC 8 UY" manufactured by Konica Minolta K.K.K.K..
Examples of commercially available products of polyester resin films include "diahail (registered trademark)" manufactured by mitsubishi resin corporation, "Lumirror (registered trademark)" manufactured by tokyo corporation, and "Cosmoshine (registered trademark)" manufactured by tokyo corporation.
Examples of commercially available products of (meth) acrylic resin films include "TEKUNOROI (registered trademark)" manufactured by sumitomo chemical corporation and "Acryprene (registered trademark)" manufactured by mitsubishi yang corporation.
Examples of commercially available polycarbonate resin films include "PANLIGHT (registered trademark)" manufactured by Kitty corporation.
Commercially available products of polyolefin resins include "Topas" manufactured by Topas Advanced Polymers GmbH and sold by polymer companies, "ARTON" (registered trademark) sold by JSR corporation, "zeonor (zeonor) (registered trademark)", "zeonex (zeonex) (registered trademark)", and "APEL" (registered trademark) (both trademarks) sold by mitsui chemical corporation, and films can be formed from the above resins.
Further, commercially available polyolefin resin FILMs can be used, and examples thereof include "ARTON FILM" sold by JSR corporation (the "ARTON" is a registered trademark of the company), "Escena" (a registered trademark) sold by waterlogging chemical industries, and "ZEONOR FILM" (a registered trademark) sold by japan ZEON corporation.
The thickness of the thermoplastic resin film is usually 5 to 100 μm, preferably 10 to 50 μm, and more preferably 10 to 30 μm.
The first protective film 7, the second protective film 8, and the third protective film 9 may be the same protective film or different protective films.
The first polarizing film 4 and the second polarizing film 5 may have the same thickness or different thicknesses. The thickness of the first polarizing film 4 is preferably 15 μm or less, and the thickness of the second polarizing film 5 is preferably 12 μm or less.
The thickness of the polarizing film is usually 3 μm or more.
(hard coating)
The first protective film 7 may be formed by providing a hard coat layer (not shown) on the surface opposite to the liquid crystal cell 20. With this hard coat layer, scratches and the like generated by the first polarizing plate 2 can be prevented.
Since the hard coat layer has a small dimensional change, the hard coat layer can further suppress the dimensional change of the first polarizing plate 2. In addition, since the first polarizing film 4 is a large factor affecting the rate of change in the size of the first polarizing plate 2, the hard coat layer is preferably provided at a position close to the first polarizing film 4 in order to more effectively suppress the change in the size of the first polarizing plate 2. Specifically, the distance between the first polarizing film 4 and the hard coat layer is preferably 30 μm or less, and more preferably 25 μm or less.
In addition, in terms of being able to suppress dimensional changes of the first polarizing plate 2, it is preferable that no adhesive layer be present between the first polarizing film 4 and the hard coat layer. In the absence of a layer having a small elastic modulus such as an adhesive layer between the first polarizing film 4 and the hard coat layer, the hard coat layer can effectively control the dimensional change of the first polarizing film 4.
In the case of providing the hard coat layer, the thickness of the hard coat layer is preferably 1 to 8 μm, and more preferably 1 to 6 μm, from the viewpoint of compatibility between the protective property and the bendability. When the thickness of the hard coat layer exceeds 8 μm, the flexibility is low, and cracks tend to be easily introduced during bending. On the other hand, when the thickness of the hard coat layer is less than 1 μm, the flexibility is good, but from the viewpoint of in-plane uniformity, sufficient characteristics tend not to be obtained in many cases.
The hard coat layer may be formed of a resin film layer. The resin for forming the resin coating layer may be a resin having sufficient strength and transparency as a coating after the resin coating layer is formed. Examples of the resin include active energy ray-curable resins such as thermosetting resins, thermoplastic resins, ultraviolet ray-curable resins, and electron ray-curable resins, and two-liquid mixed resins. Among these, the ultraviolet curable resin is preferable because it can cure the resin by irradiation of ultraviolet rays, can efficiently form a resin coating layer by a simple processing operation, and can form a light diffusion layer such as an antiglare layer. Examples of the ultraviolet curable resin include polyester, acrylic, urethane, amide, silicone, and epoxy resins. The wettability (contact angle of a water droplet) of the hard coat layer can be adjusted by a known method such as adding an additive to the resin (coating liquid).
As a method for forming the hard coat layer, a suitable known method can be used, and for example, a method of applying the resin (coating liquid) and then drying the resin can be mentioned. In the case of using a curable resin as the resin for forming the resin coating layer, a curing treatment is performed after coating. As a method for applying the coating liquid, a method such as spray (fountain), die coater, casting (casting), spin coating, spray metering (fbutain metering), gravure, or the like can be used. In the coating, the coating liquid may be diluted with a common solvent such as toluene, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, isopropyl alcohol, or ethanol, or may be undiluted.
(reflection type polarizing plate)
The reflection-type polarizing plate 6 has a function of transmitting light polarized in the transmission axis direction of the second polarizing film 5 and reflecting light polarized in the absorption axis direction.
As the reflective polarizer 6, there can be mentioned: a grid-type polarizing film, a multilayer thin film laminate of 2 or more layers obtained from 2 or more materials having a difference in refractive index, vapor-deposited multilayer thin films having different refractive indices used in a beam splitter or the like, a multilayer thin film laminate of 2 or more layers obtained from 2 or more materials having birefringence, a film obtained by stretching a resin laminate of 2 or more layers obtained from 2 or more resins having birefringence, a film in which polarization directions are separated by reflecting/transmitting linearly polarized light in orthogonal axial directions, and the like.
The multilayer film laminate constituting the reflection type polarizing plate 6 has a structure in which the first optical material layer and the second optical material layer are alternately laminated in the thickness direction.
Specific examples of the material of the first optical material layer and the second optical material layer include polyethylene naphthalate (PEN) and isomers thereof (e.g., 1, 4-PEN, 1, 5-PEN, 2, 7-PEN, 2, 3-PEN, etc.), and polyalkylene terephthalates (e.g., polyethylene terephthalate (PET), polybutylene terephthalate, and 1, 4-cyclohexanedimethanol terephthalate), methacrylic resins (e.g., polymethyl methacrylate (PMMA)), polycarbonate resins, polystyrene resins, polyolefin resins (e.g., polystyrene and polypropylene), and cyclic polyolefin resins.
Specific materials of the first optical material layer and the second optical material layer may be a copolymer of PEN, a copolymer of polyalkylene terephthalate, or a styrene copolymer. Specific examples of the copolymers of PEN include copolymers of 2, 6-naphthalenedicarboxylic acid or esters thereof, 1, 4-naphthalenedicarboxylic acid or esters thereof, 1, 5-naphthalenedicarboxylic acid or esters thereof, 2, 7-naphthalenedicarboxylic acid or esters thereof, and 2, 3-naphthalenedicarboxylic acid or esters thereof with a) terephthalic acid or esters thereof, b) isophthalic acid or esters thereof, c) phthalic acid or esters thereof, d) alkanediols, e) cycloalkanediols (e.g., cyclohexanedimethanol), or f) alkanedicarboxylic acids (e.g., cyclohexanedicarboxylic acid).
Specific examples of the copolymer of polyalkylene terephthalate include copolymers of terephthalic acid or an ester thereof with a) naphthalenedicarboxylic acid or an ester thereof, b) isophthalic acid or an ester thereof, c) phthalic acid or an ester thereof, d) alkanediol, e) cycloalkanediol (e.g., cyclohexanedimethanol), f) alkanedicarboxylic acid, and/or g) cycloalkenedicarboxylic acid (e.g., cyclohexanedicarboxylic acid).
Specific examples of the styrene copolymer include a styrene-butadiene copolymer and a styrene-acrylonitrile copolymer. Further, as the material of the first optical material layer and the second optical material layer, ABS resin (acrylonitrile-styrene-butadiene copolymer resin) and MS resin (methyl methacrylate-styrene copolymer resin) can be cited. Examples of commercially available reflection polarizers include "DBEF" (registered trademark), "APF-V3" (product name), and "APF-V2" (product name) manufactured by 3M company.
Further, each of the first optical material layer and the second optical material layer may be a mixture of 2 or more of the polymers or polymer copolymers exemplified above. The materials exemplified above are also preferable in terms of small absorption coefficient and small loss due to absorption.
The thickness of the reflection type polarizer 6 is usually 5 to 100 μm, preferably 10 to 50 μm, and more preferably 10 to 30 μm.
The reflection type polarizer 6 preferably has a dimensional change rate in the direction along the polarization reflection axis C (longitudinal direction) when heated at 85 ℃ for 100 hours of-1.4 to 0%, more preferably-1.2 to 0%, and further preferably-0.5 to 0%.
The reflection-type polarizing plate 6 having the above dimensional change rate can be obtained by, for example, adjusting the stretching ratio in the production of the reflection-type polarizing plate 6 or adjusting the time for which annealing treatment is performed.
Specifically, the dimensional change rate is a value measured in the following manner. First, the reflection type polarizing plate 6 was cut into a size of 100mm in the polarization reflection axis direction × 100mm in the transmission axis direction, and after standing for 1 day in an environment of 23 ℃ and 55% relative humidity, the size in the polarization reflection axis direction, that is, the size before heat treatment was measured. Next, the dimension in the polarization reflection axis direction, that is, the dimension after heat treatment, of the reflection type polarizing plate 6 after being left standing at a high temperature of 85 ℃ for 100 hours was measured. Substituting the measurement results into the following formula S1From this, the reflection of polarized light can be determinedRate of change of dimension in the axial direction.
S1(size after heat treatment-size before heat treatment) × 100)/size before heat treatment (adhesive or bonding agent)
As a method of laminating the films constituting the first polarizing plate 2 and the second polarizing plate 3, a method of bonding the films with an adhesive or an adhesive is generally used. In addition, as a method of laminating the second polarizing plate 3 and the reflective polarizer 6, a method of bonding with an adhesive or an adhesive is generally used.
When the films are laminated, the same type of adhesive or bonding agent may be used, or different types of adhesive or bonding agents may be used.
Examples of the adhesive include an aqueous adhesive and a photocurable adhesive. The aqueous adhesive is an adhesive obtained by dissolving an adhesive component in water or an adhesive obtained by dispersing an adhesive component in water, and the adhesive layer can be made thin. As the aqueous adhesive, an aqueous adhesive in which the main component of the adhesive (composition) is a PVA-based resin or a urethane resin is preferable.
The PVA-based resin may be partially saponified polyvinyl alcohol or completely saponified polyvinyl alcohol, and may be a modified PVA-based resin such as carboxyl-modified polyvinyl alcohol, acetoacetyl-modified polyvinyl alcohol, hydroxymethyl-modified polyvinyl alcohol, or amino-modified polyvinyl alcohol. When a PVA-based resin is contained as an adhesive component, the adhesive is often prepared as an aqueous solution of the PVA-based resin. The concentration of the PVA resin in the adhesive is usually about 1 to 10 parts by weight, preferably 1 to 5 parts by weight, per 100 parts by weight of water.
In order to improve the adhesiveness, it is preferable to add a curable component such as glyoxal or a water-soluble epoxy resin, or a crosslinking agent to an adhesive containing a PVA-based resin as a main component. Examples of the water-soluble epoxy resin include: and polyamide polyamine epoxy resins obtained by reacting epichlorohydrin with polyamide polyamines obtained by reacting polyalkylene polyamines such as diethylenetriamine or triethylenetetramine with dicarboxylic acids such as adipic acid.
Commercially available products of the polyamidepolyamine epoxy Resin include "Sumirez Resin (registered trademark) 650 (30)", "Sumirez Resin (registered trademark) 675", sold by Sumika Chemtex, and "WS-525" sold by Star light PMC, and these commercially available products can be suitably used.
The amount of the curable component or the crosslinking agent added is usually 1 to 100 parts by weight, preferably 1 to 50 parts by weight, based on 100 parts by weight of the PVA-based resin. When the amount added is small, the effect of improving adhesiveness is small, while when the amount added is large, the adhesive layer tends to become brittle.
The laminate bonded with the water-based adhesive is usually subjected to a drying treatment, and the adhesive is dried and cured. The drying treatment can be performed by blowing hot air, for example. The drying temperature is usually 40 to 100 ℃, preferably 60 to 100 ℃. The drying time is, for example, about 20 to 1,200 seconds. The thickness of the adhesive layer after drying is usually about 0.001 to 5 μm, preferably 0.01 μm or more, and preferably 2 μm or less, and more preferably 1 μm or less. If the thickness of the adhesive is too large, the appearance of the polarizing plate tends to be poor.
After the drying treatment, curing is carried out at a temperature of room temperature or higher for at least half a day, usually 1 day or longer, and sufficient adhesive strength can be obtained. Typically, the curing is performed in a state of being wound into a roll. The curing temperature is preferably 30 to 50 ℃ in general, and more preferably 35 ℃ or higher and 45 ℃ or lower. When the curing temperature exceeds 50 ℃, so-called "overwinding" is likely to occur in a state where the coil is wound into a roll. The humidity during curing is preferably selected appropriately so that the relative humidity is 70% or less, for example. The curing time is usually about 1 to 10 days, preferably about 2 to 7 days.
Examples of the photocurable adhesive include a mixture of a photocurable epoxy resin and a photocationic polymerization initiator. Examples of the photocurable epoxy resin include an alicyclic epoxy resin, an epoxy resin having no alicyclic structure, and a mixture thereof. As the photocurable adhesive, an adhesive obtained by adding a radical polymerization initiator and/or a cationic polymerization initiator to an epoxy resin, an acrylic resin, an oxetane resin, a polyurethane resin, a polyvinyl alcohol resin, or the like can be used.
The laminate bonded via the photocurable adhesive is irradiated with active energy rays after lamination to cure the photocurable adhesive. The light source of the active energy ray is preferably an active energy ray having an emission distribution at a wavelength of 400nm or less, and specifically, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a chemical lamp, a black light lamp, a microwave-excited mercury lamp, a metal halide lamp, or the like can be preferably used.
The irradiation intensity of the light to the photocurable adhesive is appropriately determined depending on the composition of the photocurable adhesive, but the irradiation intensity in the wavelength region effective for activation of the photocationic polymerization initiator is preferably 0.1 to 6,000mW/cm2. The irradiation intensity is 0.1mW/cm2In the above case, the reaction time becomes excessively long, and the irradiation intensity is 6,000mW/cm2In the following case, it is preferable that the risk of yellowing of the epoxy resin or deterioration of the polarizing plate due to heat radiated from the light source or heat generated during curing of the photocurable adhesive is small.
The light irradiation time of the light-curable adhesive is controlled for each light-curable adhesive to be cured, but the cumulative light amount expressed as the product of the irradiation intensity and the irradiation time is preferably 10 to 10,000mJ/cm2The mode of (2) is set. The cumulative light amount irradiated to the photocurable adhesive was 10mJ/cm2In the above case, a sufficient amount of active species derived from the polymerization initiator is generated to more reliably perform the curing reaction, and the amount is 10,000mJ/cm2In the following case, the irradiation time is preferably not too long, and good productivity can be maintained. The thickness of the adhesive layer after the irradiation with the active energy ray is usually 0.001 to 5 μm, and preferably 0.01 μm or more and 3 μm or less.
The pressure-sensitive adhesive may be any pressure-sensitive adhesive that satisfies various properties (transparency, durability, reworkability, etc.) required for an optical film, and may include an acrylic pressure-sensitive adhesive containing an acrylic resin that is obtained by radical polymerization of an acrylic monomer composition containing a (meth) acrylate as a main component and a small amount of a (meth) acrylic monomer having a functional group in the presence of a polymerization initiator and has a glass transition temperature (Tg) of 0 ℃ or less, and a crosslinking agent.
(liquid crystal display panel)
Next, the structure of the liquid crystal display panel 30 of the present embodiment will be described with reference to fig. 3. Fig. 3 is a schematic cross-sectional view showing the structure of the liquid crystal display panel 30.
The liquid crystal display panel 30 of the present embodiment has the following configuration: the first polarizing plate 2 is bonded to the front surface side of the liquid crystal cell 20 via an adhesive layer 10a, and the second polarizing plate 3 and the reflective polarizing plate 6 are bonded to the back surface side of the liquid crystal cell 20 via an adhesive layer 10b in a state where the reflective polarizing plate 6 faces the opposite side to the liquid crystal cell 20.
The pressure-sensitive adhesive forming the pressure-sensitive adhesive layers 10a and 10b may be any pressure-sensitive adhesive that satisfies various properties (transparency, durability, reworkability, and the like) required for an optical film, and may be an acrylic pressure-sensitive adhesive containing an acrylic resin obtained by radical polymerization of an acrylic monomer composition containing a (meth) acrylate as a main component and a small amount of a (meth) acrylic monomer having a functional group in the presence of a polymerization initiator and having a glass transition temperature (Tg) of 0 ℃ or less, and a crosslinking agent.
The liquid crystal cell 20 may be a liquid crystal cell of any conventionally known mode such as a VA (Vertical Alignment) mode, an IPS (In Plane Switching) mode, a TN (Twisted Nematic) mode, an ECB (Electrically Controlled Birefringence) mode, an OCB (Optically Compensated Birefringence) mode, or the like.
According to the polarizing plate assembly of the present invention, even if the thickness of the liquid crystal cell 20 is 0.4mm or less, the warping of the liquid crystal display panel 30 in a high temperature environment or the like can be remarkably suppressed.
(liquid Crystal display device)
Next, the structure of the liquid crystal display device of the present embodiment will be described with reference to fig. 4. Fig. 4 is a schematic cross-sectional view showing the structure of the liquid crystal display device.
The liquid crystal display device shown in fig. 4 includes the liquid crystal display panel 30 shown in fig. 3 and a backlight 40. The backlight 40 is disposed on the liquid crystal display panel 30 on the side opposite to the second polarizing plate 3. A light diffusion plate 50 that diffuses light emitted from the backlight 50 is disposed between the liquid crystal display panel 30 and the backlight 40.
In the liquid crystal display device, an image can be displayed by making illumination light emitted from the backlight 50 enter from the back side of the liquid crystal display panel 30 and making light modulated by the liquid crystal display panel 30 exit from the front side of the liquid crystal display panel 30.
The backlight 40 is not limited to the direct type in which light is irradiated from a position facing the liquid crystal display panel 30 toward the liquid crystal display panel 30 through the light diffusion plate 50, and may be the side light type in which light guided through a light guide plate disposed at a side edge portion of the liquid crystal display panel 30 and facing the liquid crystal display panel 30 is irradiated toward the liquid crystal display panel 30.
As described above, in the liquid crystal display panel 30 including the polarizing plate assembly 1 of the present embodiment, warpage due to shrinkage of the first polarizing plate 2, the second polarizing plate 3, and the reflective polarizer 6 can be suppressed, and thus display quality can be improved.
Here, the arrangement relationship of the polarizing plate assembly 1 (hereinafter referred to as model a) of the present embodiment is shown in fig. 5 (a). Fig. 5 (B) shows the arrangement of the polarizing plate assembly (hereinafter referred to as model B) of the comparative example. In the model B, the same portions as those of the polarizing plate assembly 1 are not described, and the same reference numerals are given to the drawings.
In model a shown in fig. 5 (a), the first polarizing film 4 constituting the first polarizing plate 2 has a polarized light absorption axis a in the short side direction. The first polarizing film 5 constituting the second polarizing plate 3 has a polarization absorption axis B in the longitudinal direction, and the reflective polarizer 6 has a polarization reflection axis C in the longitudinal direction.
In contrast, in model B shown in fig. 5 (B), the first polarizing film 4 constituting the first polarizing plate 2 has a polarization absorption axis a in the longitudinal direction. The second polarizing film 5 constituting the second polarizing plate 3 has a polarization absorption axis B in the short-side direction, and the reflective polarizer 6 has a polarization reflection axis C in the short-side direction.
The polarizing plate assembly of model A, B was bonded to a 5-inch diagonal glass substrate that simulated a liquid crystal cell 20, and the amount of warpage (mm) occurring in the longitudinal direction and the lateral direction when heated at 85 ℃ for 24 hours was measured. The measurement results are shown in fig. 6 (a) and (b). Fig. 6 (a) is a characteristic diagram showing the measurement results of model a, and fig. 6 (B) is a characteristic diagram showing the measurement results of model B.
As shown in fig. 6 (a), the warpage of the model a is greater at the center than at both ends in the longitudinal direction (convex shape), and greater at both ends than at the center in the short-side direction (concave shape).
On the other hand, as shown in fig. 6 (B), the model B has a shape in which both ends are warped by a larger amount than the center in the longitudinal direction (concave shape), and the center is warped by a larger amount than both ends in the short-side direction (convex shape).
In addition, it can be seen that: the model a suppresses the amount of warpage generated in the longitudinal direction and the short-side direction more than the model B. In particular, it is known that: the model a suppresses the amount of warpage generated in the longitudinal direction more significantly than the model B.
As described above, in the liquid crystal display panel 30 in which the polarizing plate assembly 1 of the present embodiment is bonded to the liquid crystal cell 20, warpage due to shrinkage of the first polarizing plate 2, the second polarizing plate 3, and the reflective polarizer 6 can be suppressed, and thus display quality can be improved in the liquid crystal display device.
Examples
Hereinafter, the effects of the present invention will be more clearly understood by examples. The present invention is not limited to the following examples, and can be carried out with appropriate modifications within a scope not changing the gist thereof.
In the present example, the polarizing plate assemblies of model a (examples 1 to 5) and the polarizing plate assemblies of model B (comparative examples 1 to 5) each including a reflective polarizer having a different dimensional change rate were produced in the following manner.
(preparation of first polarizing film)
A polyvinyl alcohol film (average degree of polymerization: 2400, degree of saponification: 99.9 mol% or more) having a thickness of 30 μm was uniaxially stretched by dry stretching to about 4 times, and then immersed in pure water at 40 ℃ for 40 seconds while being kept under tension, and then immersed in an aqueous solution having a weight ratio of iodine/potassium iodide/water of 0.04/5.7/100 at 28 ℃ for 30 seconds to perform dyeing treatment. Thereafter, the plate was immersed at 70 ℃ for 120 seconds in an aqueous solution having a weight ratio of potassium iodide/boric acid/water of 11.0/6.2/100. Subsequently, the film was washed with pure water at 8 ℃ for 15 seconds and then dried at 60 ℃ to obtain a polarizing film having a thickness of 12 μm in which the polyvinyl alcohol film was adsorbed and oriented with iodine.
(preparation of second polarizing film)
A polyvinyl alcohol film (average degree of polymerization: about 2400, degree of saponification: 99.9 mol% or more) having a thickness of 20 μm was uniaxially stretched in the machine direction by about 5 times by dry stretching, and then immersed in pure water at 60 ℃ for 1 minute while being kept under tension, and then immersed in an aqueous solution at 28 ℃ for 60 seconds at a weight ratio of iodine/potassium iodide/water of 0.05/5/100. Thereafter, the plate was immersed in an aqueous solution at 72 ℃ having a weight ratio of potassium iodide/boric acid/water of 8.5/8.5/100 for 300 seconds. Subsequently, the film was washed with pure water at 26 ℃ for 20 seconds and then dried at 65 ℃ to obtain a polarizing film having a thickness of 7 μm and having iodine adsorbed and oriented on the polyvinyl alcohol film.
(production of reflection type polarizing plate)
First, as the thermoplastic resin A, B, the following thermoplastic resins were prepared.
Thermoplastic resin A: polyethylene naphthalate (refractive index of 1.65) obtained by polycondensation of dimethyl naphthalene 2, 6-dicarboxylate and ethylene glycol by a conventional method was used.
Thermoplastic resin B: polyethylene naphthalate (refractive index: 1.65) obtained by copolymerizing 30 mol% of terephthalic acid was used.
In addition, thermal measurement of the polymer was performed in advance using a thermal differential scanning instrument, and it was confirmed that the thermoplastic resin a was crystalline and the thermoplastic resin B was amorphous.
Next, thermoplastic resin A, B was put into 2 single-screw extruders and kneaded while being melted at 300 ℃. After passing through 5 FSS type leaf disc filters, 903 layers using a configuration of 3 slit plates in total of 2 slit plates with a slit number of 301 and 1 slit plate with a slit number of 303 were joined together by a laminating apparatus while measuring the lamination ratio of the thick film layer from which the film was removed to 1/1 with a gear pump. A laminate in which 903 layers were alternately laminated in the thickness direction was produced.
Next, the laminate was fed to a T die, formed into a sheet, and then rapidly cooled and solidified on a casting drum having a surface temperature of 25 ℃ while applying an electrostatic application voltage of 8kV to the wire, to obtain an unstretched film. The unstretched film was longitudinally stretched 5.0 times at 140 ℃ by a longitudinal stretcher, and then subjected to intermediate cooling at 70 ℃ and heat treatment at 160 ℃ to obtain a laminated film having a thickness of 34 μm.
(polyvinyl alcohol adhesive)
The polyvinyl alcohol adhesive was prepared by dissolving 2 parts by weight of acetoacetyl-modified polyvinyl alcohol (trade name "Gohsefimer (registered trade name) Z-200" manufactured by japan synthetic chemical industries, ltd.) and 2 parts by weight of sodium glyoxylate (trade name "SPM-01" manufactured by japan synthetic chemical industries, ltd.) in 100 parts by weight of water.
(preparation of first polarizing plate (front polarizing plate))
A protective FILM (trade name "ZEONOR FILM (registered trademark) ZF 14-023" manufactured by ZEON corporation, Japan) having a thickness of 23 μm was bonded to one side of the first polarizing FILM with a polyvinyl alcohol adhesive, and a triacetyl cellulose (TAC) FILM (25 HCN-TC "manufactured by letterpress printing, Ltd., thickness of 32 μm) having a hard coat layer was bonded to the other side of the first polarizing FILM with a polyvinyl alcohol adhesive. Next, a 20 μm thick adhesive (trade name "NCF # KT" manufactured by LINTEC) was applied to the ZEONOR FILM side.
(production of second polarizing plate and reflection polarizer (Back-side polarizing plate))
A cellulose ester film (KC2CT) made by Konica Minolta having a thickness of 20 μm was bonded to one side of the second polarizing film with a polyvinyl alcohol adhesive, and then a 20 μm-thick adhesive (trade name "NCF # KT" made by LINTEC) was bonded to the cellulose ester film side. The other side of the second polarizing film was further bonded with a reflection type polarizing plate via an adhesive having a thickness of 5 μm (trade name "NCF # L2" manufactured by LINTEC).
Next, measurement samples were produced by bonding the polarizing plate assemblies of examples 1 to 5 and comparative examples 1 to 5 to a glass substrate simulating a liquid crystal cell as follows.
(preparation of measurement sample)
A4.3 inch (96 mm. times.48 mm) polarizing plate cut into pieces was bonded to a 5.2 inch (116 mm. times.67 mm) glass having a thickness of 0.3mm in accordance with the arrangement of the mold A, B.
Then, the amounts of warpage (mm) generated in the longitudinal direction and the short direction when the polarizing plate assemblies of examples 1 to 5 and comparative examples 1 to 5 were heated at 85 ℃ for 24 hours were measured as follows. The measurement results are summarized in Table 1.
(measurement of amount of warpage)
First, a measurement sample having polarizing plates attached to both surfaces thereof was left standing at 85 ℃ for 100 hours, and then the front polarizing plate was placed on the upper side of the measurement sample on the measurement stage of a two-dimensional measurement instrument "NEXIV VMR-12072" manufactured by nikon. Next, the distance from the focal point as a reference of 25 points in total of the 5 points on the long side and the 5 points on the short side of the measurement sample was measured with the focal point aligned on the surface of the measurement stage as a reference, and then the difference between the longest distance in absolute terms and the shortest distance from the measurement stage was taken as the warping amount.
(measurement of the dimensional Change Rate)
Dimensional Change Rate use when heated at 85 ℃ for 100 hoursA two-dimensional measurement instrument "NEXIV VMR-12072" manufactured by Nikon corporation was measured in the following manner. First, each film was cut into a size of 100mm (in the absorption axis direction (or reflection axis direction)) x (in the transmission axis direction) of 100mm, and the film was allowed to stand at a temperature of 23 ℃ and a relative humidity of 55% for 1 day to measure the dimension (L) in the absorption axis direction0). Next, the dimension (L) in the absorption axis direction after standing still for 100 hours in a high temperature environment at a temperature of 85 ℃ was measured1). From the measurement results, the dimensional change (%) in the absorption axis direction was determined by the following formula.
The percent change in dimension (%) [ (L)1-L0)/L0]×100
Similarly, the dimensional change rate in the reflection axis direction or the transmission axis direction is also determined.
[ Table 1]
Table 1 shows the dimensional change rates (%) in the reflection axis direction and the transmission axis direction of the reflection polarizer, the dimensional change rates (%) in the absorption axis direction and the transmission axis direction of the first polarizing plate, and the dimensional change rates (%) in the absorption axis direction and the transmission axis direction of the second polarizing plate for each of the polarizing plate assemblies of examples 1 to 5 (model a) and comparative examples 1 to 5 (model B). In addition, the results of the determination of the amount of warpage generated and the quality thereof (o/x) are shown in examples 1 to 5 (model a) and comparative examples 1 to 5 (model B). Regarding whether the warpage amount is good or bad, the case where the warpage amount is 0.55mm or less is determined as "o", and the case where the warpage amount exceeds 0.55mm is determined as "x".
In this example, the time of the heating treatment (annealing treatment) was adjusted to obtain a reflection-type polarizing plate having different dimensional change rates. Specifically, the reflective polarizers of example 5 and comparative example 5 were prepared, and the reflective polarizers of example 1 and comparative example 1 were obtained by heating the reflective polarizers of example 5 and comparative example 5 at 85 ℃ for 2500 minutes. The reflective polarizers of example 2 and comparative example 2 were obtained by heating the reflective polarizers of example 5 and comparative example 5 at 85 ℃ for 240 minutes. The reflective polarizers of example 3 and comparative example 3 were obtained by heating the reflective polarizers of example 5 and comparative example 5 at 85 ℃ for 30 minutes. The reflective polarizers of example 4 and comparative example 4 were obtained by heating the reflective polarizers of example 5 and comparative example 5 at 85 ℃ for 10 minutes. In the case where the above-described heat treatment (annealing treatment) was performed, the dimensional change rate of the reflection-type polarizing plate was measured.
Fig. 7 shows the results of measuring the change in the dimensional change rate (%) of the reflective polarizers of example 5 and comparative example 5 when heated at 85 ℃.
As shown in table 1, it can be seen; in examples 1 to 5 (model a), the amount of warpage generation in a high-temperature environment was more suppressed than in comparative examples 1 to 5 (model B).
Description of symbol mark
1 … polarizing plate assembly 2 … first polarizing plate 3 … second polarizing plate 4 … first polarizing film 5 … second polarizing film 6 … reflective polarizer 7 … first protective film 8 … second protective film 9 … third protective film 10a, 10b … adhesive layer 20 … liquid crystal cell 30 … liquid crystal display panel 40 … backlight 50 … light diffuser plate.
Claims (4)
1. A polarizing plate assembly comprising: a first polarizing plate disposed on the display surface side of the liquid crystal cell, and a second polarizing plate and a reflective polarizer disposed on the opposite side of the liquid crystal cell from the display surface,
the first polarizing plate includes a first polarizing film having a polarized light absorption axis in a short side direction,
the second polarizing plate includes a second polarizing film having a polarized light absorption axis in a long side direction,
the reflective polarizer has a polarized light reflection axis in a long side direction,
the first polarizing plate has a hard coat layer on a face opposite to the side opposite to the liquid crystal cell,
the reflection type polaroid has a dimensional change rate of-1.4% or more along the direction of the reflection axis of the polarized light when heated at 85 ℃ for 100 hours.
2. The polarizing plate assembly of claim 1, wherein the second polarizing plate and the reflective polarizer are laminated with an adhesive or bonding agent interposed therebetween.
3. A liquid crystal display panel comprising a liquid crystal cell and the polarizing plate assembly according to claim 1 or 2.
4. A liquid crystal display device comprising the liquid crystal display panel according to claim 3 and a backlight.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-144249 | 2016-07-22 | ||
| JP2016144249A JP2018013691A (en) | 2016-07-22 | 2016-07-22 | Polarizing plate set, liquid crystal display panel, and liquid crystal display |
| PCT/JP2017/021275 WO2018016216A1 (en) | 2016-07-22 | 2017-06-08 | Polarization plate set, liquid crystal display panel, and liquid crystal display device |
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| CN109477927A CN109477927A (en) | 2019-03-15 |
| CN109477927B true CN109477927B (en) | 2021-12-14 |
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| CN201780044414.6A Active CN109477927B (en) | 2016-07-22 | 2017-06-08 | Polarizing plate assembly, liquid crystal display panel and liquid crystal display device |
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| Country | Link |
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| JP (1) | JP2018013691A (en) |
| KR (1) | KR20190029689A (en) |
| CN (1) | CN109477927B (en) |
| TW (1) | TWI715793B (en) |
| WO (1) | WO2018016216A1 (en) |
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| TWI687743B (en) * | 2018-12-11 | 2020-03-11 | 友達光電股份有限公司 | Display device and manufacturing method of polarizer structure |
| JPWO2020203128A1 (en) * | 2019-03-29 | 2020-10-08 | ||
| CN113661423A (en) * | 2020-03-10 | 2021-11-16 | 株式会社凸版巴川光学薄膜 | Polarizing plate and display device using the same |
| JP2021144076A (en) * | 2020-03-10 | 2021-09-24 | 株式会社トッパンＴｏｍｏｅｇａｗａオプティカルフィルム | Polarizing plate and display device using the same |
| TW202210290A (en) * | 2020-09-07 | 2022-03-16 | 住華科技股份有限公司 | Reflective polarizing film module and display device using same |
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| JP2004212762A (en) * | 2003-01-07 | 2004-07-29 | Sumitomo Chem Co Ltd | Optical film laminated product and manufacturing method |
| JP2009251017A (en) * | 2008-04-01 | 2009-10-29 | Konica Minolta Opto Inc | Elliptical polarizing plate, and liquid crystal display using same |
| CN105122099A (en) * | 2013-04-05 | 2015-12-02 | 住友化学株式会社 | Polarization plate set and liquid crystal display panel integrated with front plate |
| CN105593724A (en) * | 2013-10-03 | 2016-05-18 | 住友化学株式会社 | Set of polarizing plates and front plate-integrated liquid crystal display panel |
| CN105717571A (en) * | 2014-12-22 | 2016-06-29 | 住友化学株式会社 | Polarizing film, manufacturing method thereof, polarizing film set, liquid crystal display panel and liquid crystal display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016071332A (en) * | 2014-09-30 | 2016-05-09 | 住友化学株式会社 | Composite polarizing plate and liquid crystal display device |
| KR20160047899A (en) * | 2014-10-23 | 2016-05-03 | 동우 화인켐 주식회사 | Display panel and image display device having the same |
| JP2016085444A (en) | 2014-10-27 | 2016-05-19 | 住友化学株式会社 | Polarizing plate and liquid crystal display device |
| JP2016118761A (en) * | 2014-12-22 | 2016-06-30 | 住友化学株式会社 | Polarizing plate and manufacturing method of the same, and set of polarizing plates, liquid crystal panel, and liquid crystal display device |
-
2016
- 2016-07-22 JP JP2016144249A patent/JP2018013691A/en active Pending
-
2017
- 2017-06-08 KR KR1020197004578A patent/KR20190029689A/en not_active IP Right Cessation
- 2017-06-08 WO PCT/JP2017/021275 patent/WO2018016216A1/en active Application Filing
- 2017-06-08 CN CN201780044414.6A patent/CN109477927B/en active Active
- 2017-07-19 TW TW106124115A patent/TWI715793B/en active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004212762A (en) * | 2003-01-07 | 2004-07-29 | Sumitomo Chem Co Ltd | Optical film laminated product and manufacturing method |
| JP2009251017A (en) * | 2008-04-01 | 2009-10-29 | Konica Minolta Opto Inc | Elliptical polarizing plate, and liquid crystal display using same |
| CN105122099A (en) * | 2013-04-05 | 2015-12-02 | 住友化学株式会社 | Polarization plate set and liquid crystal display panel integrated with front plate |
| CN105593724A (en) * | 2013-10-03 | 2016-05-18 | 住友化学株式会社 | Set of polarizing plates and front plate-integrated liquid crystal display panel |
| CN105717571A (en) * | 2014-12-22 | 2016-06-29 | 住友化学株式会社 | Polarizing film, manufacturing method thereof, polarizing film set, liquid crystal display panel and liquid crystal display device |
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| TW201809753A (en) | 2018-03-16 |
| JP2018013691A (en) | 2018-01-25 |
| CN109477927A (en) | 2019-03-15 |
| KR20190029689A (en) | 2019-03-20 |
| TWI715793B (en) | 2021-01-11 |
| WO2018016216A1 (en) | 2018-01-25 |
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